N垂直于a和b,这样a,b,n就构成了右手法则体系.
力矩＝距离乘以垂直分力（即：力矩＝力臂乘以力分解开的垂直于力臂的分力）
M的方向由一个被螺旋环绕的轴给定（即：右手法则中的拇指指向表示力矩的方向）
英语翻译1.N perpendicular to a and b such that a,b,n form right-
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